yamunāra - of the river Yamunā; jala - the water; dekhi' - seeing; cikkaṇa - glossy; śyāmala - blackish; prema-āveśe - in ecstatic love; mahāprabhu - Śrī Caitanya Mahāprabhu; ha-ilā - became; vihvala - bewildered.

While crossing the river Yamunā, Śrī Caitanya Mahāprabhu saw the glossy black water and was immediately bewildered with ecstatic love.